package com.markerhub.modules.system.shiro;

import cn.hutool.core.util.StrUtil;
import cn.hutool.json.JSONUtil;
import com.markerhub.common.lang.Result;
import lombok.extern.slf4j.Slf4j;
import org.apache.shiro.authc.AuthenticationException;
import org.apache.shiro.authc.AuthenticationToken;
import org.apache.shiro.web.filter.authc.AuthenticatingFilter;
import org.apache.shiro.web.util.WebUtils;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
public class JwtFilter extends AuthenticatingFilter {

    @Override
    protected AuthenticationToken createToken(ServletRequest servletRequest, ServletResponse servletResponse){
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        String jwt = request.getHeader("Authorization");
        if(StrUtil.isBlank(jwt)) {
            return null;
        }
        return new JwtToken(jwt);
    }

    @Override
    protected boolean onAccessDenied(ServletRequest servletRequest, ServletResponse servletResponse) throws Exception {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        String jwt = request.getHeader("Authorization");
        if(StrUtil.isBlank(jwt)){
            output(servletResponse, "请先登录");
            return false;
        }
        return executeLogin(servletRequest, servletResponse);
    }

    @Override
    protected boolean onLoginFailure(AuthenticationToken token, AuthenticationException e, ServletRequest request, ServletResponse response) {
        Throwable throwable = e.getCause() == null ? e : e.getCause();
        output(response, throwable.getMessage());
        return false;
    }

    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpServletRequest = WebUtils.toHttp(request);
        HttpServletResponse httpServletResponse = WebUtils.toHttp(response);
        httpServletResponse.setHeader("Access-control-Allow-Origin", httpServletRequest.getHeader("Origin"));
        httpServletResponse.setHeader("Access-Control-Allow-Methods", "GET,POST,OPTIONS,PUT,DELETE");
        httpServletResponse.setHeader("Access-Control-Allow-Headers", httpServletRequest.getHeader("Access-Control-Request-Headers"));
        // 跨域时会首先发送一个OPTIONS请求，这里我们给OPTIONS请求直接返回正常状态
        if (httpServletRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            httpServletResponse.setStatus(org.springframework.http.HttpStatus.OK.value());
            return false;
        }
        return super.preHandle(request, response);
    }

    private void output(ServletResponse servletResponse, String msg) {
        HttpServletResponse httpResponse = (HttpServletResponse) servletResponse;
        httpResponse.setHeader("Access-Control-Allow-Credentials", "true");
        httpResponse.setCharacterEncoding("UTF-8");
        httpResponse.setContentType("application/json;charset=utf-8");
        try {
            httpResponse.getWriter().print(JSONUtil.toJsonStr(Result.fail(msg)));
        } catch (IOException e) {
            log.error("登录异常 -- {}", e.getMessage());
        }
    }
}